.box {
    width: 300px;
    padding: 40px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: #191919;
    text-align: center;
}
.box h1 {
    color: white;
    text-transform: uppercase;
    font-weight: 500;
}
.box input[type='text'],
.box input[type='password'] {
    border: 0;
    background: none;
    display: block;
    margin: 20px auto;
    text-align: center;
    border: 2px solid #3498db;
    padding: 14px 10px;
    width: 200px;
    outline: none;
    color: white;
    border-radius: 24px;
    transition: 0.25s;
}
.box input[type='text']:focus,
.box input[type='password']:focus {
    width: 280px;
    border-color: #2ecc71;
}
.submit {
    border: 0;
    background: none;
    margin: 20px auto;
    margin-top: 0;
    display: inline-block;
    text-align: center;
    border: 2px solid #3498db;
    padding: 10px 40px;
    outline: none;
    color: white;
    border-radius: 24px;
    transition: 0.25s;
    cursor: pointer;
    text-decoration: none;
    font-size: 12px;
}
.submit:hover {
    background: #2ecc71;
    border-color: #2ecc71;
}